The summer breeze knocks,
And when I open up the window,
I hear the chirps of birds wandering from afar

I put a half-read book aside,
And say with a smile, "Where did you come from?"
With my blindfold still on, three in the afternoon...

The world is surprisingly simple,
But it's me who's bizarre,
With complication which no one ever understands...

Outside the town, in the forest, in this house beyond people's notice...
Yes, that's why none ever come to visit.

Don't make eye contact!
With a hardened heart, I resign to loneliness,
Living out my days seeing only "things"...
All I know are what's in stories,
And if I long for the world, just a bit,
Will you forgive me for it?

It faintly flowed along;
Even in this irrationality I was born into,
Surprisingly, there was life.
Somewhere inside me.

Tell me, won't that wide world
In which I imagine a wild future,
Whether it be today or tomorrow...
Won't it knock on my door?

As I was having such fantasies,
And gazing outside,
I suddenly heard someone speaking...

I knocked over my half-drunk herb tea,
Spilling it all over the desk
"What am I to do...?"
I thought, staring past the door.

"Look anyone in the eyes, and they'll turn to stone..."
That's what my parents had heard,
And it seemed my eyes were the same...

And the way that always goes in stories...
Well, such people are to be feared.
I knew that, and that's why.

A thumping sound echoed out,
The first knock I'd ever heard
And to say I was nervous...
It wouldn't be quite enough.

Let me say, that wild world
That I had imagined to knock...
In reality, it opened the door
Much more easily than I expected.

Finding me cowering, covering my eyes,
The person was surprised;
"If I look you in the eye... turn to stone..."
I stammered, but they just smiled

"I've been living afraid as well,
Afraid I'd turn to stone...
But wouldn't the world be so much better
Without that fear?"

Reverberating peacefully,
My heart overflowed with imagination,
And a bit of it rang out into the world...

And tell me, you who came to me
To teach me about a wild future...
That if I'm ever lost again,
You'll be here waiting for me.

The summer breeze comes again and blows the hood you gave me,
And I let it oh-so-gently sway in the wind.

A lot of this comes from external information on Jin's Twitter rather than anything you could clearly extract from the video alone, so... yeah. [FUTURE EDIT: Oh past vg, you're so cute.]The girl's name is Mary. In the brief section near the beginning where she's shown playing with her mother, she's 5. But for the majority of the video, she's 140. Yep.
Her mother told her not to make eye contact with anyone because simply looking at someone would turn them to stone. However, what she didn't tell Mary was that she could control it once she got older.
One day, Mary was attacked by some boys for being a "freak," so her mother turned one to stone, but lost her life as a result. This basically traumatizes Mary, and she lives alone out of fear of looking at anyone.
...But she leaves the door unlocked, because really, she wants someone to open it. Awww.
A boy from the Blindfold Gang (Seto) visits Mary. He has no relation to the boys who attacked her, since that was about a hundred years ago - he probably just heard rumors about a shut-in living in the woods.
Mary tries to tell him that he'll turn to stone, but is unclear about it, so the boy misinterprets it as her being afraid to make eye contact. Thus the boy invites Mary to join the Blindfold Gang, giving her a hood and iPod.
Mary is relieved to realize that the boy isn't turning to stone with a mere look. Of course, while we know the reason for this, who knows what she believes it is.